Measuring the knots & braids of non-Hermitian oscillators
Abstract: It may seem unlikely that rich mathematical structures remain to be uncovered in classical harmonic oscillators. Nevertheless, systems that combine non-reciprocity and loss have provided a number of surprises in recent years. I will describe how these systems naturally exhibit braids, knots, and other topological structures. I will also present measurements of these structures (using a cavity optomechanical system), and will describe their potential application in various control schemes.
CANCELLED: Programmable control of indistinguishable particles: from clocks to qubits to many-body physics
Abstract: Quantum information science seeks to exploit the collective behavior of a large quantum system to enable tasks that are impossible (or less possible!) with classical resources alone. This burgeoning field encompasses a variety of directions, ranging from metrology to computing. While distinguished in objective, all of these directions rely on the preparation and control of many identical particles or qubits. Meeting this need is a defining challenge of the field.
Quantum metrology with a trapped atom interferometer interrogated for one minute
Abstract: Precise control of quantum states allows atom interferometers to explore fundamental physics and perform inertial sensing. For atomic fountain interferometers, the measurement time is limited by the available free-fall time to a few seconds. We instead realize atom interferometry with a coherent spatial superposition state held by an optical lattice beyond 1 minute. This performance was made possible by recent advances in the understanding and control of coherence-limiting mechanisms.
Deployed quantum sensors and clocks
Abstract: Quantum sensors will broadly impact industries including transportation and logistics, telecommunications, aerospace, defense, and geophysical exploration. They offer transformative performance gains over conventional technologies; atomic clocks are precise to 1 second in 50 billion years. However, these laboratory devices are large, fragile, and expensive. Commercial quantum devices require redesign from the ground up with a focus on real-world operability.
Light Synchronization Technique Heralds a Bright New Chapter for Small Atomic Clocks
In an effort to improve atomic clocks, JQI Fellow Kartik Srinivasan and his colleagues have been exploring how light is altered as it races repeatedly around a minuscule track on a chip. In an article in Nature, they describe a new way to use the devices to make precision measurements of light. The new technique might eliminate the need for several large, energy-hungry components in next-generation optical atomic clocks and other metrology tasks.
Daniel Pimbi
Daniel Pimbi is a graduate student working on microring and photonic crystal resonators within the framework of multilayer integration. He earned a B.S. in Applied Physics from Towson University in 2020, followed by a B.S. in Electrical Engineering from Texas Tech University in 2021. In 2023, he successfully completed his M.Sc., receiving the prestigious Edward E. Whitacre, Jr., highest-ranking graduate from the College of Engineering. His master's thesis focused on the development of polarization-independent and rotation photonic Bragg grating filters.
Shao-Chien Ou
Shao-Chien Ou is a graduate student working on injection locking and self-injection locking in the context of nonlinear nanophotonics with microring resonators
Observation of a finite-energy phase transition in a one-dimensional quantum simulator
One of the most striking many-body phenomena in nature is the sudden change of macroscopic properties as the temperature or energy reaches a critical value. Such equilibrium transitions have been predicted and observed in two and three spatial dimensions, but have long been thought not to exist in one-dimensional (1D) systems.
Measuring finite-energy properties of the Fermi-Hubbard model in a trapped-ion quantum computer
Calculating the equilibrium properties of condensed matter systems is one of the promising applications of near-term quantum computing. Recently, hybrid quantum-classical time-series algorithms have been proposed to efficiently extract these properties (time evolution up to short times t). In this work, we study the operation of this algorithm on a present-day quantum computer. Specifically, we measure the Loschmidt amplitude for the Fermi-Hubbard model on a 16-site ladder geometry (32 orbitals) on the Quantinuum H2-1 trapped-ion device.